Products
Jemplate Platemaking Process
| Processes | Operations | Required Times | Remarks |
|---|---|---|---|
| Back exposure | Cut the plate into required size and expose to suitable UV light source from back (basefilm) side. | To obtain 1.2mm relief with a 3.00mm thick plate and with a normal exposure unit. 1.5 minutes | 1. Both bank and main exposures can be given simultaneously according to type of exposure unit. 2. Use an exposure unit equipped with an integrated actinometer. |
| Main Exposure | Remove protection film and vacuum contact negative film emulsion side down and expose to suitable UV light source. | 8~13 minutes | |
| Washout | Mount the exposed plate bv double sided tape on to the plate holder of wash out unit. | 3~6 minutes | 1. Adjust brush pressure according to the plate thickness. 2. Always keep washout solution at recommended equipment level. |
| Drying | Dry the plate in a suitable plate dyer at the required temperature of 50~55 ° c. | 60~90 minutes | Use a dryer equipped with a hot air blower and appropriate exhaust extraction. |
| Surface Treatment and Post Exposure | Eliminates tack from plate surface for improved ink coverage. Expose the plate again to harden remaining polymer. | Surface treatment: approx 5 minutes Post exposure: 6~10 minutes | 1. Vacuum contact unnecessary for post exposure treatment. 2. Both surface and post exposure treatments can be carried out at the same time in asuitable equipment. |
Product Handling Recommendations
- Always process Jemplate under UV free fluorescent lamps or yellow lamps.
- Always keep the plate room clean, otherwise dust my cause plate defects.
- Always return unexposed plate material back to its original light free box and preferably store flat in a dark and cool (5~25 ° c) area.
- After removal from the printing press, always clean and remove all remaining ink from the plate surface by using an approved solvent or detergent. Repack plate in a plastic bag, seal and keep in a cool and dark place.
Negative films to be used
- Negative film should have a high matt surface free from dust, masking tape and brush retouching on emulsion side.
The density of 3.5 or higher for the black part of the film is recommended.